|  | 1.4 | Network Layer Functions
| 1.4.1 | Layer 3 protocols of the TCP/IP stack

Several protocols operate at the OSI reference model network layer: IP provides connectionless, best-effort delivery routing of datagrams. It is not concerned with the content of the datagrams (packets); instead, it looks for a way to move the datagrams (packets) to their destinations. Internet Control Message Protocol (ICMP) provides control and messaging capabilities. Address Resolution Protocol (ARP) determines the data link layer addresses for known IP addresses. Reverse ARP (RARP) determines network addresses when data link layer addresses are known.
| Web Links
| Internet Protocols
| TCP/IP